Aluminium or other light metal casting for internal-combustion engines.



C. WJIULLINGEII. A ALUMINIUM OR THEH LIGHT METAL CASTING FOR INTERN/IL COMBUSTION ENGINES.

MPLICIITIOII FILED SEPT.5, 19H5.

Patented, May I5, ISI?.

UNITED STATE@ PATENT T QTTTTTE.

THOMAS CHARLES WILLIS PULLINGER, OF NEAR DUMFRIES. SCOTLAND. ASSIGNOR. BY

DIRECT AND MESNE ASSIGNMENTS, T0 AMERICAN B. H. P. AERO ENGINE CORPOR A- TION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

ALUMINIUM 0R OTHER LIGHT METAL CASTING FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

I Patented May 15, 19M.

Application led September 5, 1916. Serial No. 118.332.

To all /c/lom il.' 111113/ concern.'

Be it known that I. THonms Cnanmcs lVlLLIs IL'Lmxonn, a subject of the King of England, residing at The Brae, near Dumfries, Scotland, have invented certain new and useful Improvements in Aluminium or other Light Metal Castings for Internal- Combustion Engines, of which the following is a specification.

This invention is for improvements in or relating to aluminium or other lightmetal castings for internal combustion engines and has for its object to provide means to prevent corrosion of the interior walls of the chamber for the exhaust valves.

It is common practice to provide lightmetal water-jackets for these engines and to insert steel cylinders therein to provide a proper working surface for the piston of the engine and withstand the'bursting thrust ot the working charge. In these engines the chamber leading from the exhaust valve or valves is commonly cast in one with the light-metal water-jacket and it is found that its walls tend to become corroded by the action of the exhaust gases.

According to this invention. the chamber leading from the exhaust valve or valves of an internal combustion engine and formed in a casting of light metal is provided with a liner of steel or other metal which is lessI easily corroded by the exhaust gases than would be the case withthe casting itself.

The invention further relates to a process of securing such liners in place. consisting in mounting the liner in position in the mold prior to casting' the part which is to be lined by the said liner and then pouring in the aluminium or other light metal around the liner so that it is secured in place by the setting of the metal.

-. In someinstances it may be preferred to secure the liner in place by engaging it with parts which serve the double purpose of securing the liner and holding some other portion of the engine construction in position.

In the accompanying drawing. the aluminium water-jacket A has the valve-chamber A1 cast iu one with it. The steel cylinder B is secured into the nier-jacket b v any desired means. of which various are already1 in use. The valve-chamber A1 shown, is domed. but may he of any other shape. and

it is provided with a stamped steel liner C which accurately fits it.

The liner C may be secured in position in the mold before the water-jacket is cast, so that when the metal is poured in it is brought into intimate contact with and surrounds the liner. and when set firmly holds the same in place. In the example shown in the drawing. however. the liner is stamped to accurately fit the valve-chamber and is held in place by the means which fasten the guides I) for the valve-stems D1. These guides are in the form of tubes each having a fiange I)2 which butts` against onevside of the wall of the valve-chamher. and a nut D which butts against the liner on the other side of the wall of the valve-chamber and thus clamps the liner C firmly against the wall.

The liner preserves the wall of the valvechamber from'corrosion which otherwise is found to take place to a considerable extent when aluminium castings are thus used for parts through wlnch the exhaust gases pass.

Obviously any passages leading from the` valve-chamber and formed also in the aluminium or other light-metal casting could similarly be lined and for the purpose ot' this invention such passages are considered as forming part of the chamber leading from the exhaust valves. ll'here such passages are cylindrical a sleeve can be driven in or otherwise fastened within them. but no claim is made in this specification for the lining ot' cylinders which are cast in aluminium as it is common .practice to line these to give a proper wearing surfaceand also to give them the necessary strength.

Any metal can be used other than steel provided it will withstand the corrosive et'- fect of the tluid passing through the part -so lined. and vsuch lines may he cast instead metal, and a tubular guide for the stem of the exhaust-valve which guide extends through the liner and the wall of the valvechamber and is securedby butting portions carried on it which butting portions clamp the wall and liner between them and thus selchamber which does not extend into the enginecylinder and is .made of material less easily corroded by exhaust gases than light metal,-v a tubular guide for the stem of the exhaust-valve which guide extends through the liner and the Wall of the valy'erhamber, the said guide beingsl `uldered to bear against one of these parts and screw-threaded at thatend "which projects from the shouldered portion through the said parts, and a nut on the screw-threaded end so that the liner is'clamped against the wall of the chamber between the said shouldered portion and the nut, substantially as set forth.

3. ln an internal-combustion engine, the combination with a light-metal casting pro@ vided with a domed chamber which communicates by a port opposite the domed end with the engine-cylinder which port is to be controlled by an exhaust-valve, a liner of material less easily corroded by the exhaust gases than the light metal,shaped to lit into the domed chamber, and a tubular guide for the stem lof the exhaust-valve which guide extends through the domed end of the liner and valve-chamber and is secured by butting portions on the guide which butting portions clamp the wall of the chamber and the liner between them and .thus secure the liner in place, substantially as set forth.

In testimony Whereoil l have signed my name to this specification in the presence of 45 two subscribing Witnesses. l

THOMAS CHARLES WILLIS 'PULLINGER `Witnesses R. T. NiCoL, lV. LOWE. 

